dc.description.abstract | In the natural environment, the soil that carry negative charge has affinity for the metal ions, but not for organic pollutants in aqueous solution. Conventional soil modifier can increase soil organic matter content and increase their sorption capacity for organic pollutants but does not have affinity for metal ions.
In this present study, a new approach to modify soil using the specific modifier is focused. By excluding organic matters sodium montmorillonite with four special functional groups as the modifier, van der waals force, grafting method for modification of soil, and using its special structure which can absorb heavy metals and nonionic organic compounds (NOCs) simultaneously were carried out. Finally, using adsorbed heavy metal modified clay, decomposed nonionic organic were adsorbed. The results showed that ligand of modifier offer lone pair to the heavy metal to form complex reaction. The affinity for Cu2+ is better, which would be because Cu2+ has more electronegativity and binding to the ligand and hence increased adsorption. In addition, alkyl chain on the soil surface can be regarded as a partition medium. Modified clay sorption of BTEX in the distribution of soil organic-based and water solubility of organic adsorbate is inversely proportional to its distribution constant. Among different modified methods, modified clay saturation adsorption capacity of heavy metals, as well as the role of the distribution of organic matter is due to the van der waals force which is greater than the grafted way. For the same organic adsorbate (BTEX) in different adsorbent’s, distribution constant of organic carbon (Koc) and modified clay organic carbon content were negatively correlated, the distribution and behavior of BTEX by the hydrophobic modification of soil affected by the environment and structure. Natural soil by the organic modifier improved the distribution of NOCs better in this study and partition medium has affected less the polar functional groups of the distribution of BTEX behavior. Modification of soil for heavy metals is the inorganic phase of the adsorption and partition of the NOCs is the role of the organic phase. Thus it is confirmed that the role of sorption at the same time is due to the different adsorption mechanism and they do not compete with each other’’s. Due to different catalytic activity between Pd2+ and Cu2+, 75% of benzene was decomposed by Pd2+ within the first 20 s .It showed that transition metal has a good catalytic effect.
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